Fuse for shells with safety device.



R. SOHLMAN, H. NORDENPBLT a; mMoR'm FUSE FOR SHELLS WITH SAFETY DEVICE.

APPLIOATIONTILED SEPT. 1, 19in.

Patented Aug. 1, 1911.

sfriis f union.

RAGNAR soHLMAN, HENRIK Nonnsnrnrfr, AND HUGO MORN, or Boreas, SWEDEN.

FUSE FOR SHELLS WITH SAFETY DEVICE.

Specification of Letters Patent.

Patented Aug. 1, 1911.

tApplication filed. September 1, 1910. Serial No. 580,090.

managing director, HENRH; hoRDnNrnL'i,

' assistant director, and HUGO Monix, engineer, subjects of Sweden, residing at- Bofors,

Sweden, have invented new and useful Im provements in Fuses for Shells' with a Safety Device, of which the following isy a specification. i

The present invention relates to percussion fuses vof the kind provided With a safety device of such a construction as to prevent the movable percussion member from being released before the acceleration of the projectile has ceased. For this purpose, the safety device comprises an outer and an inner ring, which are separated from.

each other by an elastic member and 4heldin such a position,that the locking' members for the movable percussion member are retained by the inner ring. On the discharge of the gun, the outer ring is moved. over the l inner on account of its inertia, hereby compressing .a spring behind the ring, whereupon the elastic member will lock the rings together. the compressed spring will move the rings Anow locked together forward to such a position, as to permit the locking members to release the movable percussion member (hammer) under the action of the centrif 'ugal force.

Theinvention is applicable to base fuses as well as point fuses.

In the accompanying drawing some forms of the invention are illustrated, Figure l showing a base fuse in an axial longitudinal section and in safe position; Fior. 2 is a cross section on the line 2 2 in Fig. l, Fig. 3 a view corresponding toF.ig. l immediately before .the striking against the butt, Figzl a `section on the line 4 4 in 3, Fig. 5 an axial longitudinal section of another form of fusesin safe position, Fig. 6 a section on the line 6 6 in Fig. 5. Fig. 7 a longitudinal section of a form of point fuse in safe position, Fig. 8 a section on the line 8--8 in Fig. 7' and Fig. 9 still another form of a point fuse in safe position, shown in. an

members here consist of 'four ring quadrants Z partly embraced by an annular Zhen the acceleration has ceased,

groove e in the hammer e and also lling up the space between the fuse head g, the part 7i, and|the ring c, which latter is pressed against the fuse 'head by the elastic member Z), said member 'also pressing` thering ci against the part la.' The ring a is turned down at a for receiving the coiled spring f, when the ring is pressed against the fuse head g.

On the discharge' of the gun, the ring is' moved o ver the ring c against the head g, hereby compressing'not onlyv the spring f, but also the curved ends Z9 of the elastic member' Z1. Vhen' the acceleration h-as ceased, the ring (wis moved forward by the spring f, in which movement the ring c will partake on account ofthe elastic member Z, the quadrant [Z' as a result beingthroivn out by the centrifugal force (Figs. 3 and 1) and releasing the hammer e, which on striking against the butt Willpress the percussion cap against the point Z and'ignite'the detonator j.

In the constructional form shown in Figs. 5 and G, the locking` members (Z consist of balls, at least 4twoin number, half of each ,of the balls being embraced by the groove e in the hammer e. Their other halves are embraced by suitable holes in thepart L. The resilient member between the rings a and c here consists of a projection of the ring c.-

In the form shown in Figs. 7 and 8 the locking` members (Z (consisting of balls)` are placed between the hammer e and the part g ca-rrying'the igniting point Z. On account of the annular projection around the'4 percusion cap the balls (Z are prevented from touching the said cap. A cylindrical recess /iin the part It here embraces thespring f, when the ring a is placed against the said part il.

In the form shown in Fig. 9, the hammer e is rigidly secured to the detonator y', whereby a greater Weightof the hammer is 'obtained and consequently a higher degree 'its operation, what we claim is:

'on'dring in such'position relatively to the telescoped relatively to the first-namedl one,

'Having now particularly described the nature of our invention and-the manner of '1. ,A shell fuse comprising stationarya'nd movable percussion members, locking members engaging recesses in the latter and resting against al fiXed stop, a' longltudlnally slidablering normally resting against, afixed stop 'at its liront-.end under the action an elastic member normally holding the secfirst one as 'to surround the' locking members `of the movable percussion member, but permitting the first-named ring to "movebackf ward. on the discharge of' the gun lso as tocolnpressthe'sai'd-springand deform the said elastic member,botl 1 rings being pressed forward' by the, I'action of saidy spring' after the acceleration ,of the rojeot'ile has ceased and permitting' the `loc ing members to be released by centrifugal action.-

. Q. A shell'fuse comprising stationary and movable percussion members, 'locking' ,mem-

bers engaging Arecesses in, the latter and; resting against a. fixed stop, a longitudinally slidable ring normally 'resting against 'ai lixed stop vatits front end underftlle action .,of a'y'sp1ing, an'ol'her'ring capable of beingy a dishfshaped ring with elastic Wings normovable member carrying a percussibnl'cap' and a main detonator,l locking members'en gagingy said movable members and resting against-alixed stop, a.- longitudinally slid-4 able ring normally resting against a stop. at

vits front' endunder the action of a spring,-

another ring capable of being telescoped relat-ively'to thelirst-named one, and an elastic member normally holding the two rings in such mutual position, that the latter one will ,surround the locking piecesof the movablei percussion member, but permitting such movement of -the said rings, under the action of the initial thrust and the said spring, to release the said locking members. 'In testimony whereof we have signed our names to thisspecilication in the 'presence of ltWo subscribing Witnesses. Y VRAGNAR SOHLMAN. HENRIK NORDENFELT. '.HUGO MORN. n Allfitnes'ses:

' H. TCLAUDER,

D. DAHLSTRM. 

